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Pallet - Glossary

Pallet uses the following domain terms:

crate
A namespace containg crate functions
action
The basic unit of configuration supplied by pallet.
action plan
A sequence of actions that have been called by phase.
environment
A map that is used to pass in external data and configuration together with the servers that are running for that into pallet pallet. Can be specified at various scopes.
crate function
A function taking a session and other arguments. A crate function can call other crate functions and actions.
group
A group of identically configured nodes, represented as a group-spec, group-spec.
group-name
The name used to identify a group.
group-spec
A group of identically configured nodes, represented as a map with :group-name, :count and server-spec keys. The group-name is used to link running nodes to their configuration (via pallet.compute.Node/group-name)
node
A node in the compute service
node-spec
A specification for a node. The node-spec provides an image hardware, location and network template for starting new nodes.
phase
A function taking a session, and calling crate functions and actions
parameters
A map that is used to pass pass values between crates. Can be used on same node, or across nodes.
server
A map used to descibe the node, image, etc of a single node running as part of a group. A server has the following keys :group-name, :node, :node-id and server-spec keys.
server-spec
A specification for a server. This is a map of phases and a default node-spec. A server-spec has the following keys :phase, :packager and node-spec keys.
session
A map that is used to hold state and context information for the duration of a lift or converge call
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